1999 DODGE DURANGO Eco

Downloaded from www.Manualslib.com manuals search engine (14) Install the crankshaft damper. Tighten
damper bolt 175 N´m (130 Ft. Lbs.).
(15) Install the power steering pump.
(16) Install the fan blade assembly and fan
shroud.
(17) Install the cylinder head cover.
(18) Install the intake manifold.
(19) Refill the cooling system
(20) Raise the vehicle.
(21) Install the exhaust pipe onto the left exhaust
manifold.
(22) Lower the vehicle.
(23) Connect the negative cable to the battery.
(24) Start the engine and check for leaks.
CYLINDER HEADÐRIGHT
REMOVAL
(1) Disconnect battery negitive cable.
(2) Raise the vehicle on a hoist.
(3) Disconnect the exhaust pipe at the right side
exhaust manifold.
(4) Drain the engine coolant. Refer to COOLING
SYSTEM.
(5) Lower the vehicle.
(6) Remove the intake manifold. Refer to proce-
dure in this section.
(7) Remove the cylinder head cover. Refer to proce-
dure in this section.
(8) Remove the fan shroud. Refer to COOLING
SYSTEM.
(9) Remove oil fill housing from cylinder head.
(10) Remove accessory drive belt. Refer to COOL-
ING SYSTEM.
(11) Rotate the crankshaft until the damper timing
mark is aligned with TDC indicator mark (Fig. 57).
(12) Verify the V8 mark on the camshaft sprocket
is at the 12 o'clock position (Fig. 59). Rotate the
crankshaft one turn if necessary.
(13) Remove the crankshaft damper. Refer to
Crankshaft Damper in this section.(14) Remove the timing chain cover. Refer to Tim-
ing Chain Cover in this section.
(15) Lock the secondary timing chains to the idler
sprocket using Special Tool 8515 (Fig. 58).
NOTE: Mark the secondary timing chain prior to
removal to aid in installation.
(16) Mark the secondary timing chain, one link on
each side of the V8 mark on the camshaft drive gear
(Fig. 59).
(17) Remove the right side secondary chain ten-
sioner. Refer to Timing Chain and Sprockets in this
section.
(18) Remove the cylinder head access plug (Fig.
64).
(19) Remove the right side secondary chain guide.
Refer to Timing Chain and Sprockets in this section.
(20) Remove the retaining bolt and the camshaft
drive gear.
CAUTION: Do not allow the engine to rotate. severe
damage to the valve train can occur.
CAUTION: Do not overlook the four smaller bolts at
the front of the cylinder head. Do not attempt to
remove the cylinder head without removing these
four bolts.
CAUTION: Do not hold or pry on the camshaft tar-
get wheel for any reason. A damaged target wheel
can result in a vehicle no start condition.
Fig. 63 Cylinder Head Tightening Sequence
Fig. 64 Cylinder Head Access Plugs
1 ± RIGHT CYLINDER HEAD ACCESS PLUG
2 ± LEFT CYLINDER HEAD ACCESS PLUG
9 - 44 4.7L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine NOTE: The cylinder head is attached to the cylinder
block with fourteen bolts.
(21) Remove the cylinder head retaining bolts.
(22) Remove the cylinder head and gasket. Discard
the gasket.
CAUTION: Do not lay the cylinder head on its gas-
ket sealing surface, do to the design of the cylinder
head gasket any distortion to the cylinder head
sealing surface may prevent the gasket from prop-
erly sealing resulting in leaks.
INSTALLATION
NOTE: The cylinder head bolts are tightened using
a torque plus angle procedure. The bolts must be
examined BEFORE reuse. If the threads are necked
down the bolts should be replaced.
Necking can be checked by holding a straight edge
against the threads. If all the threads do not contact
the scale, the bolt should be replaced (Fig. 61).
CAUTION: When cleaning cylinder head and cylin-
der block surfaces, DO NOT use a metal scraper
because the surfaces could be cut or ground. Use
only a wooden or plastic scraper.
(1) Clean the cylinder head and cylinder block
mating surfaces (Fig. 65).(2) Position the new cylinder head gasket on the
locating dowels.
CAUTION: When installing cylinder head, use care
not damage the tensioner arm or the guide arm.
(3) Position the cylinder head onto the cylinder
block. Make sure the cylinder head seats fully over
the locating dowels.
NOTE: The four smaller cylinder head mounting
bolts require sealant to be added to them before
installing. Failure to do so may cause leaks.
(4) Lubricate the cylinder head bolt threads with
clean engine oil and install the ten M10 bolts.
(5) Coat the four M8 cylinder head bolts with
Mopar Lock and Seal Adhesivethen install the
bolts.
NOTE: The cylinder head bolts are tightened using
an angle torque procedure, however, the bolts are
not a torque-to-yield design.
(6) Tighten the bolts in sequence (Fig. 66) using
the following steps and torque values:
²Step 1: Tighten bolts 1±10, 20 N´m (15 ft. lbs.).
²Step 2: Tighten bolts 1±10, 47 N´m (35 ft. lbs.).
Tighten bolts 11±14, 25 N´m (18 ft. lbs.).
²Step 3: Tighten bolts 1±10, 90 degrees. Tighten
bolts 11±14, 30 N´m (22 ft. lbs.).
(7) Position the secondary chain onto the camshaft
drive gear, making sure one marked chain link is on
either side of the V8 mark on the gear and position
the gear onto the camshaft.
(8) Install the camshaft drive gear retaining bolt.
(9) Install the right side secondary chain guide.
(10) Install the cylinder head access plug.
(11) Re-set and install the right side secondary
chain tensioner.
(12) Remove Special Tool 8515.
(13) Install the timing chain cover.
Fig. 65 Proper Tool Usage For Surface Preparation
1 ± PLASTIC/WOOD SCRAPER
Fig. 66 Cylinder Head Tightening Sequence
DN4.7L ENGINE 9 - 45
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (14) Install the crankshaft damper. Tighten
damper bolt 175 N´m (130 Ft. Lbs.).
(15) Install accessory drive belt.
(16) Install the fan shroud.
(17) Install the cylinder head cover.
(18) Install the intake manifold.
(19) Install oil fill housing onto cylinder head.
(20) Refill the cooling system.
(21) Raise the vehicle.
(22) Install the exhaust pipe onto the right
exhaust manifold.
(23) Lower the vehicle.
(24) Reconnect battery negitive cable.
(25) Start the engine and check for leaks.
VALVE SPRINGS AND SEALS
REMOVAL
(1) Remove the cylinder head cover. Refer to Cyl-
inder Head Cover in this Section.
(2) Using Special Tool 8516 Valve Spring Compres-
sor, remove the rocker arms and the hydraulic lash
adjusters (Fig. 67).
(3) Remove the spark plug for the cylinder the
valve spring and seal are to be removed from.
(4) Apply shop air to the cylinder to hold the
valves in place when the spring is removed
(5) Remove the camshaft. Refer to Camshaft in
this section.NOTE: All eight valve springs and seals are
removed in the same manner; this procedure only
covers one valve seal and valve spring.
(6) Using Special Tool 8387 Valve Spring Compres-
sor, compress the valve spring.
NOTE: It may be necessary to tap the top of the
valve spring to loosen the spring retainers locks
enough to be removed.
(7) Remove the two spring retainer lock halves.
NOTE: the valve spring is under tension use care
when releasing the valve spring compressor.
(8) Remove the valve spring compressor.
(9) Remove the spring retainer, and the spring.
(10) Remove the valve stem seal.
NOTE: The valve stem seals are common between
intake and exhaust.
INSTALLATION
(1) coat the valve stem with clean engine oil and
install the valve stem seal. make sure the seal is
fully seated and that the garter spring at the top of
the seal is intact.
(2) Install the spring and the spring retainer.
(3) Using Special Tool 8387 Valve Spring Compres-
sor, compress the spring and install the two valve
spring retainer halves.
(4) Release the valve spring compressor and make
sure the two spring retainer halves and the spring
retainer are fully seated.
(5) Install the camshaft. Refer to Camshaft in this
section.
(6) Position the hydraulic lash adjusters and
rocker arms (Fig. 67).
(7) Install the cylinder head cover.
HYDRAULIC LASH ADJUSTER
REMOVAL
(1) Remove cylinder head cover(s). Refer to proce-
dure in this section.
(2) Remove rocker arm(s). Refer to procedure in
this section.
CAUTION: If lash adjusters and rocker arms are to
be reused, always mark position for reassembly in
their original positions.
(3) Remove lash adjuster(s).
Fig. 67 Rocker ArmÐRemoval
1 ± CAMSHAFT
2 ± SPECIAL TOOL 8516
9 - 46 4.7L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (10) Collapse and pin primary chain tensioner
(Fig. 78).
CAUTION: Plate behind left secondary chain ten-
sioner could fall into oil pan. Therefore, cover pan
opening.
(11) Remove secondary chain tensioners.
(12) Remove camshaft position sensor from right
cylinder head (Fig. 79).
Fig. 76 Camshaft Sprocket V8 Marks
1 ± LEFT CYLINDER HEAD
2 ± RIGHT CYLINDER HEAD
Fig. 77 Cylinder Head Access Plug Location
1 ± RIGHT CYLINDER HEAD ACCESS PLUG
2 ± LEFT CYLINDER HEAD ACCESS PLUG
Fig. 78 Collapsing And Pinning Primary Chain
Tensioner
1 ± PRIMARY CHAIN TENSIONER
2 ± ADJUSTABLE PLIERS
3 ± SPECIAL TOOL 8514
9 - 50 4.7L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine CAUTION: Care should be taken not to damage
camshaft target wheel. Do not hold target wheel
while loosening or tightening camshaft sprocket.
Do not place the target wheel near a magnetic
source of any kind. A damaged or magnetized tar-
get wheel could cause a vehicle no start condition.
CAUTION: Do not forcefully rotate the camshafts or
crankshaft independently of each other. Damaging
intake valve to piston contact will occur. Ensure
negative battery cable is disconnected to guard
against accidental starter engagement.
(13) Remove left and right camshaft sprocket bolts.
(14) While holding the left camshaft steel tube
with adjustable pliers, (Fig. 80) remove the left cam-
shaft sprocket. Slowly rotate the camshaft approxi-
mately 15 degrees clockwise to a neutral position.
(15) While holding the right camshaft steel tube
with adjustable pliers, (Fig. 81) remove the right
camshaft sprocket. Slowly rotate the camshaft
approximately 45 degrees counterclockwise to a neu-
tral position.
(16) Remove idler sprocket assembly bolt.
(17) Slide the idler sprocket assembly and crank
sprocket forward simultaneously to remove the pri-
mary and secondary chains.
(18) Remove both pivoting tensioner arms and
chain guides.(19) Remove chain tensioner.
Fig. 79 Camshaft Position SensorÐRemoval
1 ± CRANKSHAFT POSITION SENSOR
2 ± CYLINDER HEAD COVER
3 ± CAMSHAFT POSITION SENSOR
4 ± RIGHT SIDE CYLINDER BLOCKFig. 80 Camshaft RotationÐLeft Side
1 ± CAMSHAFT SPROCKET AND CHAIN
2 ± ADJUSTABLE PLIERS
3 ± CAMSHAFT
Fig. 81 Camshaft RotationÐRight Side
1 ± ADJUSTABLE PLIERS
2 ± CAMSHAFT DOWEL
DN4.7L ENGINE 9 - 51
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine INSPECTION OF COMPONENTS
Inspect the following components:
²Sprockets for excessive tooth wear. Some tooth
markings are normal and not a cause for sprocket
replacement.
²Idler sprocket assembly bushing and shaft for
excessive wear.
²Idler sprocket assembly spline joint. The joint
should be tight with no backlash or axial movement.
²Chain guides and tensioner arms. Replace these
parts if grooving in plastic face is more than 1 mm
(0.039 in.) deep. If plastic face is severely grooved or
melted, the tensioner lube jet may be clogged. The
tensioner should be replaced.
²secondary chain tensioner piston and ratcheting
device. Inspect for evidence of heavy contact between
tensioner piston and tensioner arm. If this condition
exist the tensioner tensioner arm and chain should
be replaced.²Primary chain tensioner plastic faces. Replace as
required.
INSTALLATION
(1) Using a vise, lightly compress the secondary
chain tensioner piston until the piston step is flush
with the tensioner body. Using a pin or suitable tool,
release ratchet pawl by pulling pawl back against
spring force through access hole on side of tensioner.
While continuing to hold pawl back, Push ratchet
device to approximately 2 mm from the tensioner
body. Install Special Tool 8514 lock pin into hole on
front of tensioner. Slowly open vise to transfer piston
spring force to lock pin (Fig. 83).
(2) Position primary chain tensioner over oil pump
and insert bolts into lower two holes on tensioner
bracket. Tighten bolts to 28 N´m (250 in. lbs.).
Fig. 82 Timing Chain System
1 ± RIGHT CAMSHAFT SPROCKET AND SECONDARY CHAIN
2 ± SECONDARY TIMING CHAIN TENSIONER
3 ± SECONDARY TENSIONER ARM
4 ± LEFT CAMSHAFT SPROCKET AND SECONDARY CHAIN
5 ± CHAIN GUIDE
6 ± TWO PLATED LINKS ON RIGHT CAMSHAFT CHAIN7 ± PRIMARY CHAIN
8 ± IDLER SPROCKET
9 ± CRANKSHAFT SPROCKET
10 ± PRIMARY CHAIN TENSIONER
11 ± TWO PLATED LINKS ON LEFT CAMSHAFT CHAIN
12 ± SECONDARY TENSIONER ARM
9 - 52 4.7L ENGINEDN
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine CAUTION: Overtightening the tensioner arm torxT
bolt can cause severe damage to the cylinder head.
Tighten torxTbolt to specified torque only.
(3) Install right side chain tensioner arm. Apply
MopartLock N, Seal to torxtbolt, tighten bolt to 17
N´m (150 in. lbs.).
NOTE: The silver bolts retain the guides to the cyl-
inder heads and the black bolts retain the guides to
the engine block.
(4) Install the left side chain guide. Tighten the
bolts to 28 N´m (250 in. lbs.).
CAUTION: Overtightening the tensioner arm torxT
bolt can cause severe damage to the cylinder head.
Tighten torxTbolt to specified torque only.
(5) Install left side chain tensioner arm. Apply
MopartLock N, Seal to torxtbolt, tighten bolt to 17
N´m (150 in. lbs.).
(6) Install the right side chain guide. Tighten the
bolts to 28 N´m (250 in. lbs.).
(7) Install both secondary chains onto the idler
sprocket. Align two plated links on the secondary
chains to be visible through the two lower openings
on the idler sprocket (4 o'clock and 8 o'clock). Oncethe secondary timing chains are installed, position
special tool 8515 to hold chains in place for installa-
tion (Fig. 84).
(8) Align primary chain double plated links with
the timing mark at 12 o'clock on the idler sprocket.
Align the primary chain single plated link with the
timing mark at 6 o'clock on the crankshaft sprocket
(Fig. 82).
(9) Lubricate idler shaft and bushings with clean
engine oil.
(10) Install all chains, crankshaft sprocket, and
idler sprocket as an assembly (Fig. 85). After guiding
both secondary chains through the block and cylinder
head openings, affix chains with a elastic strap or the
equivalent, This will maintain tension on chains to
aid in installation.
NOTE: It will be necessary to slightly rotate cam-
shafts for sprocket installation.
(11) Align left camshaft sprocket ªLº dot to plated
link on chain.
(12) Align right camshaft sprocket ªRº dot to
plated link on chain.
CAUTION: Remove excess oil from the camshaft
sprocket bolt. Failure to do so can result in over-
torque of bolt resulting in bolt failure.
Fig. 83 Resetting Secondary Chain Tensioners
1 ± VISE
2 ± INSERT LOCK PIN
3 ± RATCHET PAWL
4 ± RATCHET
5 ± PISTON
Fig. 84 Installing Secondary Timing Chains on Idler
Sprocket
1 ± LOCK ARM
2 ± RIGHT CAMSHAFT CHAIN
3 ± SECONDARY CHAINS RETAINING PINS (4)
4 ± IDLER SPROCKET
5 ± LEFT CAMSHAFT CHAIN
6 ± SPECIAL TOOL 8515
DN4.7L ENGINE 9 - 53
REMOVAL AND INSTALLATION (Continued)

Downloaded from www.Manualslib.com manuals search engine (13) Remove Special Tool 8515, then attach both
sprockets to camshafts. Remove excess oil from bolts,
then Install sprocket bolts, but do not tighten at this
time.
(14) Verify that all plated links are aligned with
the marks on all sprockets and the ªV8º marks on
camshaft sprockets are at the 12 o'clock position (Fig.
82).
CAUTION: Ensure the plate between the left sec-
ondary chain tensioner and block is correctly
installed.
(15) Install both secondary chain tensioners.
Tighten bolts to 28 N´m (250 in. lbs.).
NOTE: Left and right secondary chain tensioners
are not common.
(16) Before installing idler sprocket bolt, lubricate
washer with oil, and tighten idler sprocket assembly
retaining bolt to 34 N´m (25 ft. lbs.).
(17) Remove all locking pins (3) from tensioners.
CAUTION: After pulling locking pins out of each
tensioner, DO NOT manually extend the tensioner(s)
ratchet. Doing so will over tension the chains,
resulting in noise and/or high timing chain loads.
(18) Using Special Tool 6958, Spanner with Adap-
tor Pins 8346, tighten left (Fig. 86) and right (Fig.
87). camshaft sprocket bolts to 122 N´m (90 ft. lbs.).(19) Rotate engine two full revolutions. Verify tim-
ing marks are at the follow locations:
²primary chain idler sprocket dot is at 12 o'clock
(Fig. 82)
²primary chain crankshaft sprocket dot is at 6
o'clock (Fig. 82)
²secondary chain camshaft sprockets ªV8º marks
are at 12 o'clock (Fig. 82)
(20) Lubricate all three chains with engine oil.
(21) After installing all chains, it is recommended
that the idler gear end play be checked (Fig. 88). The
end play must be within 0.10±0.25 mm (0.004±0.010
in.). If not within specification, the idler gear must be
replaced.
(22) Install timing chain cover and crankshaft
damper. Refer to procedures in this section.
(23) Install cylinder head covers. Refer to proce-
dures in this section.
NOTE: Before installing threaded plug in right cyl-
inder head, the plug must be coated with sealant to
prevent leaks.
Fig. 85 Installing Idler Gear, Primary and Secondary
Timing Chains
1 ± SPECIAL TOOL 8515
2 ± PRIMARY CHAIN IDLER SPROCKET
3 ± CRANKSHAFT SPROCKET
Fig. 86 Tightening Left Side Camshaft Sprocket Bolt
1 ± TORQUE WRENCH
2 ± CAMSHAFT SPROCKET
3 ± LEFT CYLINDER HEAD
4 ± SPECIAL TOOL 6958 SPANNER WITH ADAPTER PINS 8346
9 - 54 4.7L ENGINEDN
REMOVAL AND INSTALLATION (Continued)